Question
A job is done by 15 men in 30 days and 30 women in 20
days. How many days will it take for 8 men and 12 women to finish the work?Solution
15 men × 30 days = 450 Women’s 1-day work = 450/(30× 20) = ¾ work (8 Men + 12 Women)’s 1-day work = 8 +12 × ¾ = 17 Days taken by 8 M and 12 women to finish the work = 450/17 days Alternate Method: 15 Men can do this job in 30 days and 30 women can do this job in 20 days It means 45 men or 60 woemn can do this job in = 10 days So 8 Men and 12 women can do this job in = 10/{8/45 + 12/60} = 10/ {8/45+ 1/5} = 10 /{17/45} = 450 /17
If 'a' = √1024 ÷ 4 + 96 ÷ 3 + 85 ÷ 17 and 'b' = 30 × 18 ÷ 6 - 7² + 110, then find the value of (a + b).
...The greatest number that will divide 398,436, and 542 leaving 7, 11, and 15 as remainders, respectively, is:
What approximate value should come in place of question mark (?) in the following equations?
39.9% of 1720 + 80.2% of 630 = 89.9% of 1280 + ?
? = (5.8)2 + (8.9)2 + (4.7) 2 + 24.7% of 20
?% of (128.31 ÷ 15.97 × 75.011) = 419.98
What approximate value will replace the question mark (?) in the following?
29.99...
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
(11.11 ×  31.98) + 14.15% of 749.99 = ? + 124.34
456 x 99.999 + 654 = ?
Find the digit at unit place of 12349.
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